Which optional feature of an Ethernet switch disables a port on a point-to-point link if the port does not receive traffic while Layer 1 status is up?

Which optional feature of an Ethernet switch disables a port on a point-to-point link if the port does
not receive traffic while Layer 1 status is up?

A.
BackboneFast

B.
UplinkFast

C.
Loop Guard

D.
UDLD aggressive mode

E.
Fast Link Pulse bursts

F.
Link Control Word

Explanation:
UDLD aggressive mode is disabled by default. Configure UDLD aggressive mode only on point-topoint links between network devices that support UDLD aggressive mode. With UDLD aggressive
mode enabled, when a port on a bidirectional link that has a UDLD neighbor relationship

established stops receiving UDLD packets, UDLD tries to reestablish the connection with the
neighbor. After eight failed retries, the port is disabled.